The word "most quailing" is spelled with the IPA phonetic transcription /moʊst ˈkweɪlɪŋ/. The first syllable "mo" is pronounced with the long "o" sound, and the "st" consonant blend is formed at the end of the syllable. The second syllable "quai" is pronounced with a diphthong, the "a" and "i" sounds combine to form the /eɪ/ sound. The final syllable "ling" is pronounced with the /ɪŋ/ ending, which is common for English gerunds. The word "quailing" means to feel or show fear or apprehension.
The phrase "most quailing" does not have a specific etymology since it is a combination of two words.
The word "most" is derived from the Old English word "mǣst", meaning "greatest" or "a majority of". It has remained relatively unchanged throughout the centuries and is still used today with the same meaning.
On the other hand, "quailing" is a present participle form of the verb "quail". "Quail" comes from the Old English word "cwelan", which means "to die" or "to perish". Over time, "quail" developed the meaning of becoming frightened or losing courage, which is the sense used in the phrase "most quailing".
So, when combined, "most quailing" can be interpreted as the "greatest" or "majority" of something feeling frightened or losing courage.